GROUP ONE TRADING, L.P. Information

440 S. LASALLE STREET, CHICAGO, Illinois, 60605, (312) 347-8864

Report Date: 03/31/2015

Position Statistics

Total Positions 1,813
New Positions 391
Increased Positions 764
Decreased Positions 1,006
Positions with Activity 1,770
Sold Out Positions 513
Total Mkt Value (in $ millions) 843

Institutional Holdings information is filed by major institutions on form 13-F with the Securities and Exchange Commission.

Sector Weighting

Basic Materials 4.61%
Capital Goods 1.89%
Conglomerates 0.78%
Consumer Cyclical 1.99%
Consumer/Non-Cyclical 2.32%
Energy 10.14%
Financial 8.49%
Healthcare 23.73%
Services 14.58%
Technology 12.43%
Transportation 2.49%
Utilities 2.88%

1,813 Positions as of 03/31/2015

Company Class Value of Shares ($1,000s) ▼ Change in Value ($1,000s) Change (%) Shares Held
ALLIED NEVADA GOLD CORP COM 59 59 New 363,412
BIOTELEMETRY INC COM 59 -6 (9.51) 6,335
HEADWATERS INC COM 59 59 New 3,257
GULF ISLAND FABRICATION INC COM 58 8 15.30 5,274
FIESTA RESTAURANT GROUP INC COM 58 58 New 1,184
IROBOT CORP COM 58 -435 (88.19) 1,815
PERION NETWORK LTD SHS 58 -78 (57.38) 20,062
ARMSTRONG WORLD INDS INC NEW COM 58 -488 (89.41) 1,090
DORMAN PRODUCTS INC COM 58 58 New 1,200
OMNOVA SOLUTIONS INC COM 57 -9 (13.34) 7,390
VIRTUS INVT PARTNERS INC COM 57 30 111.43 444
ALLIANCE DATA SYSTEMS CORP COM 57 -21 (27.14) 196
PORTLAND GEN ELEC CO COM NEW 57 17 41.29 1,711
CRESTWOOD MIDSTREAM PARTNERS L UNIT LTD PARTNER 56 43 353.70 4,850
WINDSTREAM HLDGS INC COM NEW 56 -89 (61.59) 8,513
ZENDESK INC COM 55 50 1,023.26 2,415
BURLINGTON STORES INC COM 55 -1,092 (95.22) 1,077
NATUS MEDICAL INC DEL COM 55 55 New 1,300
CHINA DISTANCE ED HLDGS LTD SPONS ADR 54 20 60.86 3,460
ASA GOLD AND PRECIOUS MTLS LMT SHS 54 -10 (15.46) 5,469